Vacuum cleaner



FIG. 1 is a front, top and right side perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is top, front and left side perspective view thereof; and

FIG. 4 is a bottom, rear and right side perspective view thereof. 

The ornamental design for a vacuum cleaner, as shown. 